Progress is underway to add support for both messaging and display of gamercard information within the XBL Status program. There are two branches on the Launchpad page – one for each planned feature. Once stable, they will be combined into the main development branch.
Current development: https://code.launchpad.net/xblstatus
Screenshots
Gamerscore development screenshot
Messaging development screenshot
I apologize for the lack of window borders, but I can never seem to take proper screenshots with Compiz enabled.